a. Bot. [f. Gr. τετράδυμ-ος (see prec.) + -OUS.] Said of an agaric having each perfect lamella or gill separated from the next by four equal short lamellæ and three longer ones alternately placed, thus |;l:l:l;|; see also quots.
[1856. Henslow, Dict. Bot. Terms, Tetradymus, where every alternate lamella of an Agaric is shorter than the two contiguous to it, and one complete lamella terminates a set of every four pairs of short and long…. Also, where four cells or cases are combined.]
1866. Treas. Bot., Tetradymous, having four cells or cases.
